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Andrei [34K]
3 years ago
5

The __________ is the lowest level of life's structural hierarchy.

Biology
2 answers:
Tresset [83]3 years ago
7 0
The correct answer is cell
lions [1.4K]3 years ago
4 0

Answer:

A) Cell

Explanation:

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If there are 12 sister chromatids in a cell, how many centromeres are there?
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Each pair of sister chromatids is bound by one centromere, so there should be 6 centromeres.
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In fruit flies, red eyes are dominant to green eyes. In a cross between a short-winged, green-eyed fly and a long-winged, red-ey
cricket20 [7]
C) because the first fly has all recessive traits and so it would be llrr and the second fly has to have at least 1 dominant allele for the wings (Ll or LL) and for the eye color (Rr or RR) so c would be your best answer
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3 years ago
Which statement explains why hydrogen bonds are able to form between water molecules?
11111nata11111 [884]

<span>Hydrogen bonds do not form in all molecules because hydrogen can only form these bonds with highly electronegative atoms. It is a weak type of force that happens when a hydrogen atom is bonded to an atom which has a high electronegativity. For water, it is present because hydrogen is bonded to oxygen which is very electronegative.</span>

4 0
3 years ago
Why do psychologists always develop a hypothesis at the beginning of a research project?
Arte-miy333 [17]

Answer: If you have an isolated piece of data, there is a near infinite number of hypotheses that can explain that piece of data. This is called “Underdetermination”.

Therefore, just going out and collecting bits of data doesn’t really advance our understanding of the universe. A near infinite number of possible explanations? We’re overwhelmed. Therefore, data without a hypothesis to relate it to can’t be evaluated.

BUT, one of the things you do when testing a hypothesis is to figure out what data you are looking for. Instead of collecting just any data, you are looking specifically for particular data.

If the hypothesis is true, then there is data that should be present if you look for it. For instance, say my hypothesis is that people who smoke have less lung capacity than non-smokers. What do you need lung capacity for? Well, blowing out birthday candles. Or blowing up a balloon. So a deduction is that non-smokers will not be able to blow up a balloon with one breath as a non-smoker. That is a deduction.

So now you can look for a specific fact: ability to blow up a balloon on a single breath.

Get a pack of balloons (spherical ones are best), and at least 20 people: 10 non-smokers and10 smokers. Then have each person take a deep breath and try to blow up a balloon. Measure the circumference. Have each person do it 3 times. Average the circumference measurements of all the tries of all the people in each group. Compare.

(My ENT has a fancy machine to measure lung capacity, but the balloon thing will work. I picked this because I saw a student use it once in a high school science fair. I thought it was pretty clever.)

If it turns out that the circumference is the same between the groups, you have managed to falsify the hypothesis. You at least know it is wrong.

What you also can do when you have a hypothesis and experiment is that you can design the controls to eliminate as many of those alternate hypotheses that we can think of. For instance, we would also expect younger people to have greater lung capacity than older people. And men are generally bigger, with bigger lungs, than women. So you could make sure you matched up ages and gender between the smokers and non-smokers so you can eliminate those other hypotheses.

So now the data means something — because it is related to a hypothesis. You don’t just have the circumference of balloons blown up by 20 random people. That could mean anything. Instead, those circumferences tell you something about the effects of smoking on lung capacity.

Explanation:

6 0
3 years ago
If the midwest experiences a severe drought that damages the corn crops, we should expect the
Reil [10]

If the Midwest experiences a severe drought that damages the corn crops, we should expect the supply of corn to decrease and the price of corn to rise.

Severe drought is a long period of abnormally low rainfall and dry weather, in a specific region, which negatively affects plants and living organisms. Severe droughts can have a considerable effect on the agriculture and ecosystem of the affected region. Severe drought damages crops, thus it influences crop production.


5 0
3 years ago
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